NATS 1565 Study Guide - Final Guide: Psychological Dependence, Caffeine, Stimulant
6 May 2019
School
Department
Course
Professor
Document Summary
Depressant opium/heroin/morphine/codeine (derived from same plant source) A narcotic drug is one that induces central nervous system depression, resulting in numbness, lethargy, and sleep. Psychological dependence desire to re experience the effects. Physiological dependence - withdrawal symptoms and effort to avoid them. Tolerance - need for more drug to create the same effect. Certain secondary plant products chemically resemble neurotransmitters. They are chemical messengers within the nervous system. Neurotransmitters are released by the axon of one nerve cell (neuron), and enter the space (synaptic cleft) between it and the next neuron. Neuron - is a cell that carries electrical impulses. If the next (post synaptic) neuron has the right receptors in its membrane, the neurotransmitter molecules will connect with the receptors, causing a change in the next neuron. Receptors are molecules that sit in the membrane and are made of protein. Receptors need to have the correct shape to pick up a specific neurotransmitter (ex.
